package 补充.输入输出操作.文件操作;

import java.util.Scanner;

public class 标准输出流 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个字母");
        String s = sc.next();
        try {
            Integer.parseInt(s);
        }catch (Exception e){
            System.out.println(e);
            System.out.println("程序内部出现问题");
        }
    }
}
